0,1
R. K. Guy, Unsolved Problems in Number Theory, E16.
a(n)=A003124(n), n>0. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 26 2008
Sequence in context: A084472 A077489 A153674 this_sequence A033420 A020993 A115020
Adjacent sequences: A008900 A008901 A008902 this_sequence A008904 A008905 A008906
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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